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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41921c24796cf798cb410e3b293d9442b86844a38a4ee950c7e3ccf297d6de30' 
  AND token = 'V95L1xXlRj12ug05D5B2ccoY9Zz6OFZEIiUYs5ytuhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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