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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a569f5d5073721372391dd788da3f70b47ed4a20592c1853a45780b9451c8b8c' 
  AND token = 'MB+ujpp7csp3X7reL2UI8yXD3HakqSydU85ikBysjE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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