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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40cc70eed2e9a9c6e681dfc858550265b943a56bc99bac8a566179ba14354b80' 
  AND token = 'W7yDkNF3mWWeI15yiSBWGpW4QaLM7B7h1W/qEb2ewQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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