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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66946078e7ba5c9dfe21c43a2c745dcf99e5d34b168763aa9ae569f6543feb2e' 
  AND token = 'fZNaxWOev7X3E13g84DIWM1Dd2qya0aS2+QZKcWMaQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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