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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e8f52e21903bb54195d1260e073e092233bc658f0a5e57ba5ea4bd0eb882c7' 
  AND token = 'nlJGZZSx+5O+twyo8C2AWPJo7Bcbw/g2+ItEoyRvo9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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