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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b322f3e10724435377eee23b7e278d8f28daa2d38e547963df9505c888eafd5' 
  AND token = 'rzo9qBjQTeue7F0A/CJxVo2jLhmvh8hGmfcvTM0Hv1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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