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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd584cd0e840d0ab0c1610d0e543876d3687adc8339a76291337354fbeaf4e7d' 
  AND token = 'eVa8PgHGFNPVyTBgyEzD/7xQTnvFw/AfGRzsIyW8LIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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