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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e65e2d0903c5b8251708fe8dcd231ace79003b833dc8370a0712c863b6571a4' 
  AND token = 'ouw2vnCr0N2931Vw+yDM8z3AfZ9XifRjTcrM8xD8jD8=' 
  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"
    }
  }
}