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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae382c7518db0c9a191662826cca6391f7a87c4971d2ace831509446d4bdffb' 
  AND token = 'lMzmdUdpEyK0akofGuatZcDmCfvv/fm9QkK6E+zInTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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