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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60cfe706ec41d2c2b824e49fff47065665f8f7b89e4a14de06b8884a0bfbea29' 
  AND token = 'NgE1iqEPx9qlWALkfwDPv9Ne6HMb17yQHIEybtwydzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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