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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0480e1a9a45d6ea95698f47619aee810ba6cdac3de71bd511ba879d74938c7c1' 
  AND token = '7BACbm06fxihuHBfRWIXNafZG87r+c2fg8rfrB9Xabc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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