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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59ef8b4b8d8bb1ce4055651fc9fcb7a0dd9c5c5a4474a19f7a54376bf08f0c5' 
  AND token = 'TD+rPgyaviDjBWeIGFr8XDXqxxvXpF5y+M0zf74PZys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}