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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb11261f22e9c1c60353339bf18d298dd8af9dfc086353a334ab2f1fc36afd1' 
  AND token = 'E9j8KfdJ44Chxbz0Tksd7MtAlO4FsQWM++Da3uOfSvA=' 
  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"
    }
  }
}