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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf63f28f719bc1dc417c67014f69e5213d7f69a6594754c8ca6073b63cf72a4' 
  AND token = '7qB6fu35djSyxiBr1vK3RFmcjxuMIlGyEW35pkpKFSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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