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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5415810e6739456dbfccd1c6ed07cdb3d8b81a247d0865cee36b9171158b9440' 
  AND token = 'bb7Ys7Qfgdwee/pTMbf54DqIJlETMTN8wfO/tVMi7/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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