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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e015914d559d0f05f09652445e23c0652d658e89b02719488f24f765d8ecfa2f' 
  AND token = 'bCRYDDmOTbzNsjfEhPIQ//tFFdr6/v5K8yiviOHt89g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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