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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f31665fae4830b9427794cfb4232639741538680b435ec8be1eb9211836345' 
  AND token = 'jGyP1z1oX3xvgO2Jw+Xk0tvcl4+EqjIs8w6ecnHAd0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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