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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197d2402bc5779fc1cbaf5b84192a05c1609640d552938fadab2a7b2ef847e8e' 
  AND token = 'KwGUgQh6MS4eqXcUYnrwnGbAQ+L75QDIRrLi22CVEYY=' 
  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"
    }
  }
}