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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb13ce23b7737c69847f968dcdd995cca253b8d5f2ce4e2e2ac790040e0433b8' 
  AND token = 'hhs0v+nhwXZ8DxePVRLqXcXrl1Az6rYuOUdofki+izw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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