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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297263b312f352af166c8ee00aef8ed4ccdcfb5b6eb55974f27dc5f17c3e0591' 
  AND token = 'eMp1gUsRRSBA+AoskF228TyNPPMEC9WeQ1V9hJRxrZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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