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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d4e6cf395ae06a095f19729e50b85aee0525a79ab4d167339fed4b669d8636' 
  AND token = 'efkKs+jXsAHS9C/P9oR7sBHCuCctuy+Ds+yUr52xdxw=' 
  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"
    }
  }
}