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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0baac0e6dcbc6cd093391cf160b2a55439ec40f625a4ee17cc8d74c1d75bbd97' 
  AND token = '32EYFYZUIJL11Iu91r1d9iMp/wuYmhKnPmDzFiDc5EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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