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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64beffa414c23b8d8cd76c3d9f2d7467449540e1317c45f3c4e48c20dcc19fb7' 
  AND token = 'xPpxcpPmYh9z+wJBz1YvonpsRRisAARWT33WZHl94I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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