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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd124c172dbcbc23203f533c55be4423c15ce0e1efe79e279417edd59084c0a57' 
  AND token = 'FRqCXucddBp3cXIhL2ymfhPR/jL2vVbaeqQoXXrrWQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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