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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b6e7376d4f49fd51b1dbfce2c9a0e6b22ffbfa926c3b72e8e17f6efb880663' 
  AND token = 'wjlQmKgKX4JmYcKID8SZ0uJJyyREcPmdlN5JclnVE5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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