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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce49fee101d535f8c91df960599730031a57627191b244d214268442a827e2b' 
  AND token = '9uLeMAzWqXcCKjc7Xsx1fjnKGOEaMBPbyRfgRZCAUXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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