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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7315fba1f596484e00c2c4ad524b5a10a04357ae589250185cec86acaad3e26a' 
  AND token = '/CZ5Ke5XLGe08X8gp6jfMTGG8pP1gOaXxgS8EH3Vl+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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