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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8f20c148c0d1974ea924f6b1a75c11c5495b76db8cf33da3c6124283db9ec1' 
  AND token = 'EBKpU0D24+usw0U0FD0uTxt1HFEXe1yDVP9pRqQmE7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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