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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee282abb30fdea49fdb1688ce9bfa507732d853af9ad7e0524ce9eaa8a9e9d7' 
  AND token = 'kqT1A2gFVLrSTCyAc2yFuhjaw9mZp7m0cHb6L4PZhyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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