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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e958a314255144512ce1722e88f6c0f7cdc8b522eed6e27b7a49ef1acce42d' 
  AND token = 'dVCEYe4edI0n9xydxZzJln8p+zJwK3xYP87Q2QauuP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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