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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687e199196c0d329f1c0fb55a8de0312bf205c00ea122ce725c8c8609327c728' 
  AND token = '6esONJs3VLJHG16G+oy/tHwITQyoMv0KH949jE+1jxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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