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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ebe552524a21e9abc6ac17d7bb465c36f39d04fe46e2c892ea0840437f86027' 
  AND token = 'FMA/JFWRGb90aUQYL3iqM5gQFDzV7rYJ/LF2ODtRd6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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