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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31cf0c3693fa7ad89306ecabe31e34ff66cf381193733eb8f11417c1cd11679e' 
  AND token = 'XFJ5uYT/j7qcAD+HFwXQ7VDJ3n2yCmeFUpJU4U73AUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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