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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4993ebe91db7f00c9e1dc8a21ee0b7aa9b22261c646e218a5828dc4338cc2ac4' 
  AND token = 'IikZMjkfy/1yEAHnYL/4W6w/UGSQzivJk9KMtYx9EnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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