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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b4091e077e09c147f0c8171b963890d9ef7a3733f6c5d09c4a54090086f5a11' 
  AND token = '44o8A/JkiyUWqcddg2ObVcV+Qa69wCROyMf1qQNWKaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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