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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f103c8792ab0091d3b7c427b84013d004ca29f98c635f7f3b1140ee1b7d8eb7' 
  AND token = 'ziUpA3qLDSiafGoRAPGfksJ+nhlyj2SiTqT7NW/uj8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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