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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5066ab9e0f64bdb10ee7f25704ac6ac9a8aa857d4e70d3066bb7b3bea4a1b8da' 
  AND token = 'xqN+lnc4Mo37qTiQrohh640ipNIkVR8q0Mvq9H5lAUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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