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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682a087d90e30b4c2b568e0db1bf8a3c0113eb9150cf44ff48bde3db08c483b3' 
  AND token = 'MihIaJHxeLktLFv/3N4biTd2HGajNxgCt+iNCA4y1xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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