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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0366f57d7119e2bf32530816bd1f8530f718fdd9488ac7c22b56fd1c5dedc26d' 
  AND token = '17T/xk1MRsiLevzQ+KTdw7eNKRWaDU5oz7rF1+1gCzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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