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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3c2e266dd89499d2aea7d1bdb2774028ff4cb101951a20091803af4ee284f6' 
  AND token = 'YZLfwpAsrk06ao98i+33kG3suT+EWh20jPL4rlZx+s8=' 
  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"
    }
  }
}