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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417383ee596ef68003270e08033a3ca4d0496b46cc6c79c7f7d6df3cd043631f' 
  AND token = '4H99DX0noPJfNURccPMlRZlpIGwYRSH8Qoay/vMszkY=' 
  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"
    }
  }
}