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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa15a41199a99d2282b6065c78dc5a8ad307241e701590ba01c35e130f44bfcc' 
  AND token = 'q0b5dp2ZRBH3y7+7uMOWb9Hv2nrQs2L9Aiiw2miSh1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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