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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33aa734b6e5da7f46f0f39d455996f7ff233478a281ce765730f0d2ac27379fd' 
  AND token = 'ou5jNT51ONY9DxUaAg3Jlc8jAnmm/52pRLWd44fn+bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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