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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c9d48185395da2797bce087f75109cff08fdaa86fac7a83d4ce7fd13be522f' 
  AND token = 'ejvDfzOKTgW8DYhhLksVuywosNphuDAa9iOFDmycZ9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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