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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597bbe76414c8d25cceba11483218b1bb72220a5c0d78d0ca0eea5b547e9c450' 
  AND token = 'S8mHTxfV6AZu78py9qT7/nd8kRfHYlNCAqupGLOlDLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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