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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebb29ca8a4fe4840dc93035824bafada27df5d4b84137094db0b5854f896a15' 
  AND token = 'zP51jTnhq2ltE1Q8u9X82erh6smiPi4yhNM6E/wpJzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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