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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f137e9573c8ea4882b5d8041829c7a58aedff5510d4567c118d1e65dc6b8731' 
  AND token = 'lAc3QkrDYgAMT0BaHxu9R+7trxH7RzgDUvLTtr40whg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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