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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784a3cca570bc13dd2db9fca4647b10c8d7c7a868ec966c72fab8dae42b298f7' 
  AND token = 'MHlFw9ql9ITGMHBt4ykcF9yi4n93Rx3GJrl3rdWH4ac=' 
  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"
    }
  }
}