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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6bd8a966b34a8354aed46ed544fb9f3ccc6a315c608cf08f8000c1559481a98' 
  AND token = 'fxEYgHFzlNSp0Uxr7jmWXK4jvwecnRzMTLoi/Cwuc7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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