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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc685d00ac2f72021cc92a6300558839cf01d4332a6396657b64c5cfd16376d' 
  AND token = 'anQ4dk+zuWk/sf9Eixqfagt2dOjHDQO6G49YdDZ4Lag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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