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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f8fa4a2a64467be55cc0201a185b712ec22fbd49bf9f3abad27c71bcbe2cef' 
  AND token = 'Dk8vaj4QjAGtTxVEH1nl8tkrx085AY5SvMMV479B618=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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