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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97771dcad6c6ade883aec68d659b8c80e7e8d2cee53d72882dcfc84b608d53f' 
  AND token = 'Y5nJlR4FRJr4Ru4Uq4+lzaSnJX9HS1dd5L2C4JDZnUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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