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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5df89f036f4de7398a9d6679ac3f39a46d44d8acc534d2c3d5f0780623128f2' 
  AND token = 'qaTV7gy76H6ClcKti7aYLI5HP2QWj8+BcsJAHctt6c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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