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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b7907e335c0729f43ef57d5de5d0066dc07125efa9c4db877ee3dd80f37459' 
  AND token = 'L8vIZYXYolxtykwa8KuudAvmZHLVaPs5n2BHf/tb6bk=' 
  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"
    }
  }
}