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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69eb340d491a4c2b402c1d65d3f5a573c2011c31e55cdd0d3ad65ee71a3e1afd' 
  AND token = '0731Ofz2g0UmBaDQj/GJq821JAnC14OVDPNR3FSWvyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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