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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ff3fd27740c86c166238d16c2f85420811b2d9e4a38409106e9fffcc21892b' 
  AND token = 'wykqRRC1mcugZ1bftmDCEEVhzl8zAH8vaSit5C/Edn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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