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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231a020cb86451477af69c8a9773b69221c78c8899d7703d033bf1f60fa38aa0' 
  AND token = 'UBMFYpGt2b9Dc6hD27SJGE/HTIacFyeA+WwErJXaXdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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