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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840ad383b9db8096c3cc5889f5eaee43f3d4cdf24eb5c0779cac2c1309af9b9b' 
  AND token = 'JKI/bm7nTOyxb9Gya2bb5AFQxxOmXZ6Zfnz3XDESids=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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