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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0fc83249e1ff29194603eef65e8054c0722d4feca261634466c03a98b3684f' 
  AND token = 'MbOfbTqbXgSSFGNywXm/6crK+Q7AECX9UKRo0+e4r+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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