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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0661d83c84ce186d1a8192b84fe72e7aa47c9ca435a5b8058f50917ebc423c1' 
  AND token = 'CB9Aywt9xa25lQ4Frq9jL78OWDHrXvFAxLvlBJbAKm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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