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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1653935b00679a9affbac6851040050b219aab13da8db6cfe063ef1f87c0d583' 
  AND token = 'yd3FnXWBw1NE+NO6PN5KmxUjhsOBRezZZx0kqCfE3wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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